Make the author name an optional part of the MSI install path

[freakboy3742]

What is the problem or limitation you are having?

When an MSI installer runs, it installs the app in an AppData/<author name>/<app name> path. This follows the preferred scheme for Microsoft packaging, but it isn't required.

It's not uncommon to see apps packaged in an AppData/<app name> path; and, if a solo developer is building the app, it may be preferable to use this scheme, rather than putting the author's name into the path.

Describe the solution you'd like

A new option use_full_install_path (open to suggestions for a better name) should exist for MSI installers. This will default to True; but if a value of False is specified, the author name will be excluded from the install path.

Describe alternatives you've considered

1. Do nothing; require the fully qualified install path
2. Instead of a boolean option, let the user configure everything after the AppData path. e.g., have a install_path setting that defaults to {app.author_name}/{app.formal_name}, but can be explicitly set to anything else the user may want.

I've suggested the boolean option rather than the fully-customised option because the need isn't for full customisation - the install path should always be the app's formal name; it's only a question of whether the author name is included as well.

Additional context

Requested by @davidfokkema on Discord.

[davidfokkema]

I implemented a fix in beeware/briefcase-windows-app-template#11, but have not yet documented it in briefcase.

[freakboy3742]

@davidfokkema The app template modification looks great; there's a need for an analogous fix on the VisualStudio template.

[freakboy3742]

@davidfokkema Looks like the only piece left is documentation - are you intending to tackle that, or should I open it up for a PyCon US sprint contributor?

[davidfokkema]

@davidfokkema Looks like the only piece left is documentation - are you intending to tackle that, or should I open it up for a PyCon US sprint contributor?

I'm looking into that right now!

[davidfokkema]

Thanks for accepting my PRs!